TGR, round roof duct

TGR (round)

General

Roof vent TGR (round) has been specially developed for DTH roof fans. Together the roof fan and roof vent form an elegant architectural whole. The roof fan is mounted directly on top of the roof vent. The base can be mounted with a diffusor or the vent can be extended with a duct or T-pipe.

Installing a suction duct in the room enables an optimum air handling solution with minimum pressure drop and low sound levels, even at high airflow rates.

Externally, TGR is constructed from galvanised sheet, and under it 50 mm mineral wool, fine-mesh fabric and an internal galvanised perforated sheet. The roof vent is supplied with an internal cable duct. Optional bracket. Warranty is void if the bracket is not mounted in accordance with the instructions.

	The roof vent is insulated for sound and condensation. To avoid transfer of vibrations to the roof vent, a rubber ring is mounted on the fan.
	The roof vent has been designed to take an electric cable via the integral cable duct. The installation cable is inserted in the cable duct at the bottom and drawn up by the safety switch, which is not normally an EXHAUSTO delivery. The safety switch is mounted on the control panel as shown in the guide 3004346.

TGR is supplied as standard in 3 lengths and 6 sizes with PERFORM flashing appropriate to the roof pitch. TGR is also available with zinc flashing or without flashing. Must be stated on order.

Damper and extractor fitting

Dimensions

*Weight includes AOR and 30° PERFORM flashing

Max. roof pitch for length L1:
Flashing can vary by ±2.5° relative to the given roof pitch

Flashing and roof pitch

Flashing can vary by  ±2.5°relative to the given roof pitch.

With zinc flashing, dimensions E, G and F are always 100 mm.

AOR Anti-backdraught shutter (standard)

As standard the roof vents are mounted with anti-backdraught shutter AOR, but can also be specially ordered without this.
When cleaning the roof vent and/or connector duct, the anti-backdraught shutter is easily detachable without use of tools.
The anti-backdraught shutter AOR opens when the fan is in operation.

Pressure loss graph

P_t = total pressure drop
Temperature: t = 20 °C
Density = 1.2 kg/m³

Installing TGR

Make a hole in the roof about 30 mm larger than the vent, and loosen overlying tiles/panels, sliding them upwards to permit insertion of flashing.

Carefully position the vent on the roof with the flashing level with the roof tiles. Fix the brackets to the vent, lifting it by about 5 mm when the brackets are subsequently fixed to the rafters. This will ensure that the whole weight rests on the brackets.

Roll out the flashing and knock it carefully into shape (with PERFORM, a rubber hammer or sandbag must be used). Replace overlying tiles/panels over the flashing.

Installation examples

	An EXHAUSTO roof fan, roof vent and diffusor at the base of the roof vent will provide an optimum air handling solution for the minimum of space, for example on flat or sloping roofs with a short distance to the extraction point.
	If there is a long distance between the roof vent and the extractor fitting, an extension can be formed with spiral tube or similar, with a duct fitting directly attached to the base of the roof vent.
	If ventilation is required from several locations, a spiral tube can be mounted to the base of the roof vent with duct fittings or T-pieces, sound locks etc. connected to a complete ducting system to the desired locations.

TGR - sound data

Lp = sound pressure level dB(A) in the room

Assumptions for Lp:

Tolerance +/- 4dB. Load attenuation is stated without the sound level from AOR.